I went to the co-op today to try switching out the left crank, and was
surprised to find it closed! With a hand-written note stapled to the
door: "Self service day cancelled, we are sorry". It was in English
only - I'd kind of like to think it was put up for my sake, but who
knows. Pretty bummed out, walking the one-cranked bike there and back
wasted nearly an hour, but oh well. I might try again on Sunday.